Pulsed light emitting device and sensor

Abstract

This application relates to the field of photoelectric sensor technology, and proposes a pulsed light emitting device and sensor. The pulsed light emitting device includes: a light-emitting module comprising a circuit board, a pulse generating circuit, a light-emitting device, and a convex lens. The pulse generating circuit and the light-emitting device are respectively disposed on the circuit board. The convex lens is disposed on the light-emitting side of the light-emitting device and coaxially arranged with the light-emitting device. The center normal of the light-emitting surface of the light-emitting device coincides with the optical axis of the convex lens. An encapsulation structure covers the outside of the light-emitting module. The pulse generating circuit outputs a pulse driving signal to the light-emitting device, driving the light-emitting device to emit a pulse-modulated light beam. The convex lens focuses the pulse-modulated light beam and emits it outwards. By adopting a pulse-modulated light emission method, ambient light interference can be significantly suppressed, improving detection stability and accuracy. It has advantages such as small footprint, good heat dissipation, and low power consumption, and can be adapted to precision fixtures, confined installation spaces, and various industrial automation equipment.

Description

Technical Field

[0001] This application relates to the field of photoelectric sensor technology, and more specifically, to a pulsed light emitting device and sensor. Background Technology

[0002] Industrial automation sites are filled with a large number of interfering light sources, including continuous or intermittent ambient light such as workshop lighting, sunlight, welding arc light, and equipment indicator lights. Ordinary bright photoelectric sensors are susceptible to ambient light interference, resulting in problems such as signal misjudgment, detection failure, and decreased accuracy.

[0003] Currently, most photoelectric sensors with anti-light interference capabilities employ continuous high-frequency light emission schemes. However, continuously driving the light-emitting diode generates significant heat, making it difficult to achieve ultra-thin and miniaturized sensor housings to meet heat dissipation requirements. Simultaneously, the internal installation space in industrial production lines, precision equipment, and small fixtures is becoming increasingly limited, placing higher demands on the ultra-thin and miniaturized installation of sensors. However, existing anti-light interference photoelectric sensors have loosely arranged internal driving, receiving, and filtering circuit components, resulting in a relatively large overall thickness, making them unsuitable for compact installation spaces.

[0004] Therefore, there is an urgent need for a pulsed light emitting device that combines strong ambient light interference resistance, small and ultra-thin packaging structure, and low power consumption operation characteristics to meet the increasingly stringent comprehensive performance requirements of optoelectronic detection equipment in complex industrial environments. Summary of the Invention

[0005] To address at least one of the aforementioned technical problems, the first aspect of this application proposes a pulsed light emitting device.

[0006] The second aspect of this application proposes a sensor.

[0007] In view of the above, the first aspect of this application proposes a pulsed light emitting device, comprising: a light-emitting module, the light-emitting module including a circuit board, a pulse generating circuit, a light-emitting device, and a convex lens, the pulse generating circuit and the light-emitting device being respectively disposed on the circuit board, the convex lens being disposed on the light-emitting side of the light-emitting device and coaxially disposed with the light-emitting device, the center normal of the light-emitting surface of the light-emitting device coinciding with the optical axis of the convex lens; an encapsulation structure covering the outside of the light-emitting module; the pulse generating circuit outputs a pulse driving signal to the light-emitting device to drive the light-emitting device to emit a pulse-modulated light beam, and the convex lens focusing the pulse-modulated light beam and emitting it outward.

[0008] In conjunction with the first aspect, in some feasible ways, the light-emitting device is a red light-emitting diode or an infrared light-emitting diode.

[0009] In conjunction with the first aspect, in some feasible ways, the pulse driving signal output by the pulse generating circuit has a light emission frequency range of 1kHz to 1000kHz and a duty cycle range of 5% to 95%.

[0010] In conjunction with the first aspect, in some feasible ways, the emission frequency and duty cycle parameters of the pulse generation circuit are configurable to adapt to the response speed and anti-interference requirements of different light-receiving devices.

[0011] In conjunction with the first aspect, in some feasible ways, the packaging structure is an integral structure formed by the interlocking of plastic and metal, with a sealed cavity formed inside the packaging structure, in which the circuit board, light-emitting device and pulse generating circuit are housed.

[0012] In conjunction with the first aspect, in some feasible ways, the package structure is provided with mounting holes and mounting slots for detachably mounting the package structure to an external device.

[0013] In conjunction with the first aspect, in some feasible embodiments, the pulsed light emitting device further includes: a circuit protection module, which includes a current limiting circuit and a voltage regulating circuit. The current limiting circuit is connected between the light-emitting device and the pulse generating circuit, and the output terminal of the voltage regulating circuit is connected to the power input terminal of the pulse generating circuit.

[0014] In conjunction with the first aspect, in some feasible implementations, the light-emitting module further includes: at least one power port disposed on the circuit board, wherein an external power supply is connected through the at least one power port and then transmitted to the pulse generating circuit through a voltage regulator circuit.

[0015] In conjunction with the first aspect, in some feasible ways, the packaging structure has an annular groove, a convex lens is embedded in the annular groove, and the light-emitting surface of the convex lens is lower than or flush with the outer surface of the packaging structure.

[0016] The second aspect of this application discloses a sensor comprising: a pulsed light emitting device as described in any of the above technical solutions.

[0017] Compared with related technologies, this application has the following technical advantages: The pulsed light emitting device provided in this application includes a light-emitting module and a packaging structure. The light-emitting module includes a circuit board, a pulse generating circuit, a light-emitting device, and a convex lens. The pulsed light emitting device provided in this application adopts a pulse modulation light emission method, which can significantly suppress ambient light interference such as sunlight, workshop lighting, and welding arc light, thereby improving detection stability and accuracy. Its internal structure is highly integrated, with advantages such as small footprint, good heat dissipation, low power consumption, and long service life. It can be adapted to precision fixtures, confined installation spaces, and various industrial automation equipment, and has strong practicality and versatility.

[0018] Additional aspects and advantages of this application will become apparent in the following description or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 One of the structural schematic diagrams of a pulsed light emitting device according to one embodiment of this application is shown; Figure 2 A second schematic diagram of the structure of a pulsed light emitting device according to one embodiment of this application is shown; Figure 3 One of the schematic diagrams of a light-emitting module according to one embodiment of this application is shown; Figure 4 A second schematic diagram of a light-emitting module according to one embodiment of this application is shown; Figure 5 A schematic diagram showing the pulse frequency and width of a pulsed light emitting device according to one embodiment of this application is shown.

[0020] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows: 100 Circuit board, 104 Pulse generating circuit, 106 Light-emitting device, 108 Convex lens, 110 Package structure, 120 Mounting hole, 122 Mounting slot, 130 Circuit protection module, 140 Power port. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0023] The following reference Figures 1 to 5 This application describes pulsed light emitting devices and sensors according to some embodiments.

[0024] like Figure 1 , Figure 3 and Figure 4As shown, the first aspect of this application proposes a pulsed light emitting device, comprising: a light-emitting module, the light-emitting module including a circuit board 100, a pulse generating circuit 104, a light-emitting device 106, and a convex lens 108, the pulse generating circuit 104 and the light-emitting device 106 being respectively disposed on the circuit board 100, the convex lens 108 being disposed on the light-emitting side of the light-emitting device 106 and coaxially disposed with the light-emitting device 106, the center normal of the light-emitting surface of the light-emitting device 106 coinciding with the optical axis of the convex lens 108; an encapsulation structure 110 covering the outside of the light-emitting module; the pulse generating circuit 104 outputs a pulse driving signal to the light-emitting device 106, driving the light-emitting device 106 to emit a pulse-modulated beam, and the convex lens 108 focusing the pulse-modulated beam and emitting it outward.

[0025] The pulsed light emitting device provided in this application includes a light-emitting module and a packaging structure 110. The light-emitting module includes a circuit board 100, a pulse generating circuit 104, a light-emitting device 106, and a convex lens 108. The light-emitting device 106 is driven by the pulse generating circuit 104 to operate in a pulse modulation mode, replacing the traditional constant-on light emission mode. This reduces average power consumption and heat generation, eliminates the dependence on large-area heat dissipation structures, and enables the overall device to be miniaturized and ultra-thinly packaged. This facilitates integration into space-constrained industrial testing equipment, while also improving the long-term operational reliability and energy efficiency of the system.

[0026] The device is coaxially arranged with the convex lens 108 and the light-emitting device 106, and the light-emitting device 106 and the convex lens 108 are strictly vertically aligned. This allows the divergent light emitted by the light-emitting device 106 to be refracted by the convex lens 108 to form a converged (or nearly parallel) and highly directional detection beam, thereby improving the light transmission efficiency and detection distance, and avoiding energy loss and interference with the received signal caused by beam divergence.

[0027] Meanwhile, through the stable control of the pulse generation circuit 104, the device can output a modulated optical signal with consistent waveform and stable timing, which can effectively distinguish it from interfering light sources such as continuous light and random flashes in the environment, and has strong ambient light suppression capabilities. Even under complex ambient lighting conditions, it can still maintain stable and accurate optical detection output, providing a high-quality light source foundation for subsequent signal processing.

[0028] The pulsed light emitting device provided in this application adopts pulsed modulation light emission method, which can significantly suppress ambient light interference such as sunlight, workshop lighting, and welding arc light, and improve detection stability and accuracy. Its internal structure is highly integrated, with advantages such as small footprint, good heat dissipation performance, low power consumption and long service life. It can be adapted to precision fixtures, narrow installation spaces and various industrial automation equipment, and has strong practicality and versatility.

[0029] In some embodiments provided in this application, the light-emitting device 106 is a red light-emitting diode or an infrared light-emitting diode.

[0030] In this embodiment, the light-emitting device 106 is a red light-emitting diode or an infrared light-emitting diode, which is highly compatible with the pulse driving method. It can quickly respond to pulse signals and achieve instantaneous high light intensity output while maintaining low average power consumption and heat generation, further consolidating the advantages of miniaturization and no need for additional heat dissipation structures. Its emission wavelength is located in the red or near-infrared band, which has low spectral overlap with stray light (such as sunlight and lighting) in common industrial environments. With pulse modulation, the ambient light suppression capability is more prominent, which can effectively improve the accuracy of signal recognition and anti-interference margin at the receiving end.

[0031] In some embodiments provided in this application, the pulse driving signal output by the pulse generating circuit 104 has a light emission frequency range of 1kHz to 1000kHz and a duty cycle range of 5% to 95%.

[0032] In this embodiment, the adjustable emission frequency of 1kHz to 1000kHz gives the device a strong adaptability to various operating conditions. When paired with a higher duty cycle, the 1kHz to 10kHz band is suitable for long-distance or high-attenuation scenarios, ensuring that the receiver captures sufficient photon energy; the 100kHz to 1000kHz band is beneficial for improving time resolution, and when combined with lock-in amplification or related detection techniques, it can further suppress broadband environmental noise, significantly improving the signal-to-noise ratio and detection sensitivity.

[0033] Meanwhile, the flexible adjustment of the duty cycle from 5% to 95% allows the device to achieve a dynamic balance between peak light intensity and average power consumption. A low duty cycle of 5% to 20% reduces heat generation and energy consumption, making it suitable for battery-powered or compact devices; a high duty cycle of 80% to 95% provides near-constant average light power, meeting the continuous illumination needs of fast-moving targets. This coordinated adjustability of frequency and duty cycle allows the same device to adapt to diverse detection tasks of different distances, materials, and speeds without hardware modifications, enhancing the system's versatility and engineering practicality.

[0034] In some embodiments provided in this application, the emission frequency and duty cycle parameters of the pulse generation circuit 104 are configurable to adapt to the response speed and anti-interference requirements of different light-receiving devices.

[0035] In this embodiment, the configurable mechanism enables the pulsed light emitting device to be precisely matched according to the inherent response characteristics of the downstream light-receiving device. Different light-receiving devices, such as PIN photodiodes, avalanche photodiodes, or photomultiplier tubes, have different frequency response bandwidths and response recovery times. By flexibly adjusting the emission frequency, it can be ensured that the emitted pulse rate falls within the optimal response frequency band of the light-receiving device, avoiding signal attenuation or distortion caused by frequency mismatch and maximizing photoelectric conversion efficiency. Simultaneously, adjusting the duty cycle controls the pulse width, coordinating it with the integration time or sampling window of the light-receiving device. This effectively avoids insufficient energy due to excessively narrow pulse width or signal saturation due to excessively wide pulse width, thereby ensuring the fidelity and dynamic range of the entire signal transmission chain. In practical applications, hardware configuration can be performed via DIP switches and external resistors on the circuit board 100, or software configuration can be performed via a register configuration interface.

[0036] In some embodiments provided in this application, the encapsulation structure 110 is an integral structure formed by the integration of plastic and metal. A sealed cavity is formed inside the encapsulation structure 110, and the circuit board 100, the light-emitting device 106 and the pulse generating circuit 104 are housed in the sealed cavity.

[0037] In this embodiment, the packaging structure 110 is an integrated structure combining plastic and metal. The metal insert provides a good heat conduction path, quickly transferring the heat generated by the pulse generating circuit 104 and the light-emitting device 106 to the surface of the package for dissipation, thus compensating for potential heat dissipation deficiencies due to the lack of a large-area heat dissipation structure. The plastic portion provides the package with good insulation and molding freedom, facilitating the realization of complex shapes and mounting structures. The integrated molding process eliminates the seams present in traditional split assembly, significantly improving the overall mechanical strength and vibration and shock resistance of the package, ensuring that internal precision components do not shift or detach under high-frequency vibration or accidental collisions in industrial environments, thereby enhancing the long-term reliability of the device.

[0038] The sealed cavity provides a reliable environmental barrier for the internal electronic components. This sealed structure effectively prevents the intrusion of external dust, moisture, oil mist, and corrosive gases, avoiding problems such as short circuits on the circuit board 100, contamination of the optical surface of the light-emitting device 106, or parameter drift in the pulse generation circuit 104. It is particularly suitable for harsh industrial environments with high humidity, dust, or the presence of volatile chemicals. Simultaneously, the sealed cavity also suppresses condensation caused by rapid temperature changes in the internal components, further protecting the cleanliness and light transmittance of the optical interface.

[0039] like Figure 2 As shown, in some embodiments provided in this application, the encapsulation structure 110 is provided with mounting holes 120 and mounting grooves 122, which are used to detachably install the encapsulation structure 110 onto an external device.

[0040] In this embodiment, the encapsulation structure 110 is provided with mounting holes 120 and mounting slots 122, allowing it to be quickly fixed to external devices using various methods such as screws, clips, or guide rails, without the need for special tools or custom brackets. Detachable installation simplifies the on-site deployment process, shortens installation and commissioning time, and facilitates complete disassembly and replacement or repair during later maintenance, reducing operation and maintenance costs. The position and size of the mounting holes 120 and mounting slots 122 can be laid out according to common industrial standards, enhancing compatibility with different brands and models of equipment.

[0041] like Figure 3 and Figure 4 As shown, in some embodiments provided in this application, the pulsed light emitting device further includes: a circuit protection module 130, which includes a current limiting circuit and a voltage regulating circuit. The current limiting circuit is connected between the light-emitting device 106 and the pulse generating circuit 104, and the output terminal of the voltage regulating circuit is connected to the power input terminal of the pulse generating circuit 104.

[0042] In this embodiment, the pulsed light emitting device further includes a circuit protection module 130, which includes a current limiting circuit and a voltage regulating circuit. The current limiting circuit is connected in series between the light-emitting device 106 and the pulse generating circuit 104, and can limit the peak current flowing through the light-emitting device 106 in real time, avoiding overcurrent surges caused by pulse drive voltage fluctuations or circuit abnormalities, effectively protecting the light-emitting diode from damage by transient high currents and extending its service life. At the same time, the current limiting effect can keep the emitted light intensity stable under pulse drive, avoid fluctuations in emitted light power caused by current fluctuations, ensure the consistency of light power for each pulse, provide a stable optical signal reference for back-end detection, and improve measurement repeatability accuracy.

[0043] The voltage regulator circuit is connected to the power input terminal of the pulse generator circuit 104, providing a clean and constant operating voltage to the pulse generator circuit 104. This suppresses voltage disturbances caused by external power supply ripple or the start / stop of other loads on the power supply line, ensuring that the pulse generator circuit 104 can still output a stable amplitude and steep-edge pulse drive signal in high-frequency switching mode. This avoids pulse amplitude drift or waveform distortion due to unstable power supply, thereby ensuring the accuracy of the emission frequency and duty cycle settings. Working together, the two circuits provide bidirectional protection for the electrical safety and signal quality of the circuit system from both the power supply and load sides, significantly improving the operational reliability of the device under fluctuating power supply conditions in industrial environments.

[0044] like Figure 3 and Figure 4 As shown, in practical applications, current limiting circuits and voltage regulating circuits are integrated together to form a current limiting and voltage regulating integrated circuit.

[0045] like Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments provided in this application, the light-emitting module further includes: at least one power port 140, disposed on the circuit board 100, and after the external power supply is connected through at least one power port 140, it is delivered to the pulse generating circuit 104 through a voltage regulator circuit.

[0046] In this embodiment, at least one power port 140 serves as a standardized external power input interface, enabling the device to be easily connected to various industrial field power supplies without the need for additional customized cables or adapter boards, thus simplifying field wiring. After the external power is introduced through the power port 140, it is directly fed to the voltage regulator circuit for processing, ensuring that the subsequent pulse generation circuit 104 receives a stable and clean power supply, effectively isolating the direct impact of external power fluctuations on the pulse signal quality.

[0047] Multiple power ports 140 can be configured as needed to support redundant access to multiple power supplies or flexible selection of different voltage levels, enhancing the compatibility of the device with external devices of different power supply standards. The ports are located on the circuit board 100 and are compactly integrated with the internal circuitry, avoiding the space occupation and additional connection losses caused by external power modules. This helps maintain the overall miniaturized packaging advantage of the device, while facilitating quick on-site wiring and troubleshooting, improving deployment and maintenance efficiency.

[0048] like Figure 2 As shown, in some embodiments provided in this application, the packaging structure 110 is provided with an annular groove, the convex lens 108 is embedded in the annular groove, and the light-emitting surface of the convex lens 108 is lower than or flush with the outer surface of the packaging structure 110.

[0049] In this embodiment, the convex lens 108 is embedded in the annular groove, and its light-emitting surface does not protrude from the outer surface of the packaging structure 110. This effectively prevents the convex lens 108 from being directly scratched or bumped by external objects during handling, installation, or use, reducing the risk of optical surface damage. The design of the light-emitting surface of the convex lens 108 being flush with or concave with the outer surface of the packaging structure 110 also facilitates wiping and cleaning, ensuring long-term light emission efficiency.

[0050] Furthermore, this flush or recessed layout eliminates installation interference caused by the protruding convex lens 108, resulting in a more regular and compact package shape. This facilitates wall-mounted installation in confined spaces or side-by-side arrangement with other equipment. Simultaneously, the embedded structure provides physical restraint and protection for the convex lens 108, preventing displacement or detachment even under slight vibration or impact. This enhances the long-term maintenance of optical path coaxiality and ensures the stability of the beam emission direction.

[0051] A second aspect of this application provides a sensor comprising: a pulsed light emitting device as described in any of the foregoing embodiments.

[0052] The sensor proposed in this application includes the pulsed light emitting device in any of the above embodiments, and thus has all the beneficial technical effects of the pulsed light emitting device, which will not be repeated here.

[0053] In practical applications, a thermally conductive pad or thermally conductive adhesive layer is provided between the light-emitting device 106 and the circuit board 100. The thermally conductive pad or thermally conductive adhesive layer is connected to the base of the packaging structure 110 through a thermally conductive via through the circuit board 100.

[0054] like Figures 1 to 5 As shown in the specific embodiments, this application provides a pulsed light emitting device and a sensor that can be installed in a limited space to solve the problems of insufficient accuracy, anti-interference and adaptability when using photoelectric sensing devices in industrial equipment.

[0055] The pulsed light emitting device includes a light-emitting module and a package structure 110. The light-emitting module includes a light-emitting device 106, a circuit board 100, a pulse generating circuit 104, a power port 140, and a convex lens 108. The light-emitting device 106 can be a red light-emitting diode or an infrared light-emitting diode. The emitted light beam is generated by the light-emitting device 106 and focused by the convex lens 108. The package structure 110 is an integrated structure combining plastic and metal, used to protect the internal circuitry and light-emitting function, and to facilitate installation. The package structure 110 has mounting holes 120 and mounting slots 122 for detachably mounting the pulsed light emitting device to industrial equipment. Figure 5 This is a schematic diagram of the pulse frequency and width of a pulsed light emitting device, where t1 represents the pulse width and T represents the pulse period.

[0056] This application provides a pulsed light emitting device and sensor that emits pulsed modulated light. The overall structure is small, ultra-thin, and highly integrated, mainly composed of two parts: a light-emitting module and a packaging structure 110. The light-emitting module includes a light-emitting device 106, a convex lens 108, a circuit board 100, a pulse generating circuit 104, and a power port 140. The packaging structure 110 includes a protective shell, a mounting groove 122, and mounting holes 120 for protecting internal components and fixing the device.

[0057] The light-emitting device 106 uses a light-emitting diode (LED). A red LED or an infrared LED can be selected based on the requirements of the detection scenario to adapt to objects of different materials, colors, and distances. The light-emitting device 106 is soldered to a designated location on the circuit board 100 in a surface mount configuration. A convex lens 108 is coaxially positioned in front of it, with the light-emitting device 106 and the lens maintaining a strict vertical center alignment. Placing the light-emitting device 106 near the lens's focal point allows the divergent light emitted by the device to be refracted by the lens into a converged (or nearly parallel), highly directional detection beam, improving light transmission efficiency and detection distance while avoiding energy loss caused by beam divergence.

[0058] The circuit board 100 is an ultra-thin integrated substrate. The pulse generation circuit 104, current limiting circuit, and voltage regulation circuit are all compactly arranged in a surface mount form, realizing circuit miniaturization. After the power port 140 is connected to an external power supply, the current is delivered to the pulse generation circuit 104 through the internal voltage regulation circuit. The pulse generation circuit 104 outputs a stable and controllable drive signal, which directly drives the light-emitting device 106 to emit light in a pulse modulation manner.

[0059] The pulse emission parameters of this application are flexibly configurable, with an emission frequency range of 1kHz to 1000kHz and a duty cycle range of 5% to 95%. Specific parameters can be set and adjusted according to the response speed and anti-interference requirements of the matching light-receiving device. Through the stable control of the pulse generation circuit 104, a modulated light signal with consistent waveform and stable timing is output, which can effectively distinguish it from interfering light sources such as continuous light and random flashes in the environment, and has strong ambient light suppression capabilities.

[0060] The encapsulation structure 110 is integrally molded from plastic and metal, forming a sealed cavity inside to protect the circuit board 100, light-emitting device 106, pulse generation circuit 104, and other components from dust, oil, and external impacts. The outer shell of the encapsulation structure 110 has mounting holes 120 and mounting grooves 122 on its side or bottom, allowing the sensor to be detachably and stably installed in confined spaces such as industrial automation equipment, small jigs, and assembly line frames using bolts or clips, ensuring convenient installation and precise positioning.

[0061] During operation, the power supply remains continuous, and the pulse generation circuit 104 maintains a fixed frequency and duty cycle. The light-emitting device 106 continuously emits a pulse-modulated beam, which is focused by the convex lens 108 and emitted outward, forming a stable and reliable detection light source. Compared with traditional constant-light emission methods, this application has lower power consumption and less heat generation, eliminating the need for a large-area heat dissipation structure, thus achieving miniaturization and ultra-thinness. It also possesses strong ambient light suppression capabilities, significantly improving detection accuracy and operational stability, making it suitable for various complex industrial automation detection scenarios.

[0062] In this application, the term "multiple" refers to two or more unless otherwise expressly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0063] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A pulsed light emitting device, characterized in that, include: A light-emitting module includes a circuit board, a pulse generating circuit, a light-emitting device, and a convex lens. The pulse generating circuit and the light-emitting device are respectively disposed on the circuit board. The convex lens is disposed on the light-emitting side of the light-emitting device and is coaxial with the light-emitting device. The center normal of the light-emitting surface of the light-emitting device coincides with the optical axis of the convex lens. An encapsulation structure is provided to cover the exterior of the light-emitting module; The pulse generating circuit outputs a pulse driving signal to the light-emitting device, driving the light-emitting device to emit a pulse-modulated beam. The convex lens focuses the pulse-modulated beam and emits it outward.

2. The pulsed light emitting device according to claim 1, characterized in that, The light-emitting device is a red light-emitting diode or an infrared light-emitting diode.

3. The pulsed light emitting device according to claim 1, characterized in that, The pulse driving signal output by the pulse generation circuit has a light emission frequency range of 1kHz to 1000kHz and a duty cycle range of 5% to 95%.

4. The pulsed light emitting device according to claim 3, characterized in that, The emission frequency and duty cycle parameters of the pulse generation circuit are configurable to adapt to the response speed and anti-interference requirements of different light-receiving devices.

5. The pulsed light emitting device according to claim 1, characterized in that, The encapsulation structure is an integral structure formed by the integration of plastic and metal, and a sealed cavity is formed inside the encapsulation structure. The circuit board, the light-emitting device and the pulse generating circuit are housed in the sealed cavity.

6. The pulsed light emitting device according to claim 1, characterized in that, The encapsulation structure is provided with mounting holes and mounting slots, which are used to detachably install the encapsulation structure onto an external device.

7. The pulsed light emitting device according to claim 1, characterized in that, Also includes: The circuit protection module includes a current limiting circuit and a voltage regulating circuit. The current limiting circuit is connected between the light-emitting device and the pulse generating circuit, and the output terminal of the voltage regulating circuit is connected to the power input terminal of the pulse generating circuit.

8. The pulsed light emitting device according to claim 7, characterized in that, The light-emitting module also includes: At least one power port is provided on the circuit board. After an external power source is connected through the at least one power port, it is supplied to the pulse generating circuit through the voltage regulating circuit.

9. The pulsed light emitting device according to claim 1, characterized in that, The packaging structure has an annular groove, the convex lens is embedded in the annular groove, and the light-emitting surface of the convex lens is lower than or flush with the outer surface of the packaging structure.

10. A sensor, characterized in that, include: The pulsed light emitting device as described in any one of claims 1 to 9.

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